PHOENIX - The trial is expected to begin in a case that has incited public outrage.
In 2011, 10-year-old Ame Deal was locked in a plastic storage trunk after stealing ice pops.
She was living with her grandmother, aunt, cousin and cousin's husband.
All four relatives were arrested after investigators said they discovered Ame had been kicked in the face, forced to consume hot sauce and beaten with a wooden panel.
Opening statements are set to begin for Samantha Allen, her cousin, at 10:30 a.m. Monday morning.
Allen is charged with first-degree murder as well as four charges of child abuse after she watched her husband John Allen lock Ame in a trunk.
The two went to bed and left the 10-year-old in there overnight.
The prosecution will be seeking the death penalty for both Samantha and John Allen.
John Allen's trial is expected to start in August.